Recommended C++ Game Engines?

Question

I'm looking for engines other than unreal to get familiar with C++. I came from using unity with C# for the past 3 years if that helps.

Answer 1

You can get Doom 3/Doom 3 BFG edition source code which is in C++. It'll probably take you several weeks/months to understand it but it's a great engine. Previous knowledge of Id Tech would help, so downloading Quake's code might be better first.

Answer 2

OGRE 3D. It's not really game engine, but could be an option for you.
GoDot Engine